Circles of machine combs



(No Model.) 5 Sheets-Sheet 1.

J. W. BRADLEY. MACHINE FOR GENTBRING AND DRILLING CIRCLES OF MACHINE cams.

No. 550,477. Patented Nov. 26, 1895.

ANDREW E GRAHAM. PNUYOifl'NO WASHINGTOILD C (No Model.) 5 SheetsSheet 2.

J. W. BRADLEY. MACHINE FOR GENTERING AND DRILLING CIRCLES OF MACHINE GOMBS.

N0. 550,477. Patented NOV. 26, 1895.

4 5/2 At/[y 5! Vi 1:

0/7/7615 ses: I77 67 6307* ANDREW a GRANAMYPNOTO'LITHO WASNINGTON n 3 hm M (No Model.) 5 Sheets-Sheet 3.

J. W. BRADLEY. MACHINE FOR GENTERING AND DRILLING CIRCLES OF MACHINE GOMBS.

No. 550,477. Patented Nov. 26, 1895.

ANDREW B GRAHAM PHOYO umO wAsmNswN Dc (No Model.)

5 Sheets-Sheet 4. J. W. BRADLEY. MACHINE FOR CENTERING AND DRILLING CIRCLES OF MACHINE COMBS.

No. 550,477. Patented Nov. 26, 1895.

ZOZPzeSS J ANDREW a GRAHAM PHOTO'LITNO WASNINGYON 0C (No Model.) 5 Sheets-Sheet 5. J. W. BRADLEY. MACHINE FOR CENTERING AND DRILLING CIRCLES OF MACHINE COMBS.

No. 550,477. Patented Nov. 26, 1895.

Hen/5 jwvenio 7".-

ANDREW s GRMAM PHOTO L'ITNO WASNINGTGNDC UNITED STATES PATENT OFFICE.

JOHN WALTER BRADLEY, OF BRADFORD, ENGLAND.

MACHINE FOR CENTERING AND DRILLING CIRCLES OF MACHINE-COMES.

SPECIFICATION forming part of Letters Patent No. 550,477, dated'November 26, 1895.

Application filed January-4, 1894. Serial No. 495,714. (No model.) Patented in England March 13, 1893, No. 5,346, and in France December 22, 1893, No. 235,011.

To all whom, it may concern:

Be it known that I, J OHN XVALTER BRAD- LEY, a subject of the Queen of England, residing at Bradford, England, have invented certain Improvements in Machines for Centering and Drilling Circles of Machine- Combs, (for which I have obtained Letters Patent in Great Britain, N 0. 5,346, dated March 13, 1893, and in France, No. 235,011, dated December 22, 1893,) of which the following is a specification.

This invention relates to improvements in automatic machinery or apparatus for centering, drilling, and cutting or drifting the holes for the pins in circles of Nobles and other machinecombs.

In the accompanying sheets of drawings, forming a part of this specification, similar letters of reference indicate corresponding parts in each of the figures.

Figure 1 is a side view of such parts of a circle-drilling machine as are necessary to illustrate the application of my improve ments. Fig. 2 is a front View of the same. Fig. 3 is a plan view of the same. Figs. 4 to 14 are views of details hereinafter referred to. Fig. 15 is a continuation of Fig. 2'.

The framework A, face-plate A, on which the circle to be drilled is mounted, and the pawl A and ratchet A connected by changegearing A to the worm A operating the faceplate A, are of ordinary construction. The spindle-head A is adjustabl y mounted in the customary manner upon the cross-slide A mounted upon the gauntree A but two spindles B and B are mounted in this head, one spindle B for drilling in the ordinary way and the other B for carrying a short stifi drill for centeringthat is to say, for ac curately marking the centers or position of the holes for the drill carried by spindle B to drill. This centering process is not new, but has hitherto been done by a short drill placed in the same spindle as the drill for finishing the hole, and has been done preparatory to the drilling process. Consequently a very considerable saving of time is effected by drilling and centering concurrently.

The centering-spindle B is mounted in bearings of the usual type for this class of spindle formed in the head A, and the drill ing-spindle B is mounted in similar bearings; but these bearings are adjustable in relation to the bearings of spindle B to allow the' alignment of the drilling-spindle in relation to the center-mark made by the centeringspindle to be accurately obtained. For this purpose the drilling-spindle B is mounted in the adjustable portion B of the head .A. This portion B is mounted in the vertical slide B Figs. 6 and 7, accurately hinged by the pin B to the head A. The slide B provides for the vertical adj ustment'of the spindle B, and to enable it to be also adjusted at right angles thereto the slide B is capable of being turned upon the pin B by the worm B and hand-wheel B mounted in bearings B on head A, engaging the segment B projecting from the back of the slide 13, Fig. 8. The bolt B connected to head A and passed through the slot B in segment B, Fig. 8, is provided to clamp these parts after adjustment. This is clearly shown in Figs. 4 and 5, which represent a plan and side view of the head and its attachments, and in Figs. 6 and 7, also a plan and side view of the head with parts in section and showing the attachment of certain other parts. Fig. 8 is a View of the right-hand end of Fig. 7. The spindles B and B are preferably driven by separate belts approximately side by side.

The tail-slide C, for traversing the spindles longitudinally, is mounted upon the two studs C C, projecting from the rear of head'A, and this slide is moved upon such studsbythe lever C Figs. 1 and 2, engaging the plungerpiece 0 fitted in slide 0. The two arms of the lever C are adjustable in relationto each other and are fixed by the bolt 0 To allow the position of the head in relation to the stud G on which such lever is mounted, to be somewhat varied, and in order to enable the stroke of the slide C to be adjusted, the lever C is connected by a slot to the piece C and the fulcrum-stud C is capable of adjustment in the slot 0 by the screw 0 so that adjusting the stud O has the effect of altering the length of that arm of the lever operating the plunger-piece C ted in a spring-box 0", formed in slide 0, in which a spiral spring 0 is placed so as to break the rigidity of the connection between The plunger-piece C is fit- I oo slide C and lever C and thus reduce the maximum pressure put upon slide C to that required to compress the spring 0 The pin C fixed in plunger-piece C and working in the slot C, Fig. 7, prevents the spring pushing piece 0 out of the spring-box, but allows it to be moved independently. The motion of the tail-slide C is communicated to the spindle B through the medium of the worm D, mounted in the arm D, projecting from plunger-piece C and adjusted by the handwheel D The worm D engages a rack cuton the side of the spring-box D fitted telescopically upon the end of the spindle D connected by the fork-piece D Fig. 10, to the spindle B in the ordinary way. To allow of some deviation in the alignment of the spindles B and D when the slide 13, carrying spindle B, is adjusted by the worm B, the end of spindle D abutting against spindle B, is made somewhat larger,and the arm D thereon carries a stud D on which the fork D is mounted. To clearly show this, a section of the junction of the end of the spindle is shown in Fig. 10. A spiral spring D", Fig. 6, is contained in the spring-box D so that the'maxi mum pressure applied to the drill-spindle cannot exceed that required to compress this spring. The lock-nuts D mounted upon the screwed end of spindle D", bear against the end of the spring-box D and prevent the spring forcing it off the spindle.

The spindle B may be operated longitudinally in a similar manner to spindle B; but I prefer to move it more gradually, so as to not feed the centering-drill carried thereby too suddenly against the circle operated upon. With this object the shank of the fork-piece E, (similar to that shown in Fig. 10,) engaging the end of spindle B, is mounted in a slide in tail-slide C, and this slide engages and is operated by the arm E projecting from the short rocking shaft E mounted in bearings formed in tail-slide C, Figs. 6 and 7. The shaft E is rocked at each movement of tail-slide O by the arm E projecting from the end and connected to the fixed stud F. by the short bridle-rod E As in this arran gement the vibration of the shaft E moves arm E in the reverse direction to that of tailslide 0, but at a slower speed, the movement of the spindle B, operated thereby, is proportionately limited and reduced in speed.

The lever C is operated to withdraw the tail piece and the drill by the cam F engaging the antifriction-roller F on the end of said lever, and the spiral spring F Fig. 1, connected to said lever and fixed at its lower end to the stationary stud F is provided to vibrate such lever in the reverse direction to the cam F and feed the drill. The cam F withdraws the drill at each revolution to clear the hole being drilled and to prevent the drill being fed too fast; but to allow it to penetrate a little farther each time it is inserted the antifriction-roller F also bears upon the comparatively slowly-revolving cam F of spiral form. These cams revolve in the direction of the arrow, Fig. 1, and are so relatively operated that the step F in the cam F passes the roller F when the elevated portion of cam F has raised said roller. The cam F is fixed upon the shaft F and the cam F is mounted upon the sleeve F revolving on said shaft, and is driven by the pulley G, fixed thereon, connected by the belt G to the pulley G on the main drivingshaft G The shaft F is driven from the sleeve F by the wheel G, fixed on sleeve F connected by the stud-wheel G5 and the change-wheels G G G and G mounted upon the stud-plate F to the wheel F fixed upon shaft F The shaft F is supported at one end by the bracket F and it is also supported by the sleeve F while the latter is mounted in the standard F.

To bring the picking mechanism into operation each time a hole is completely drilled, the arm H is provided, pivoted upon the stud H, Figs. 1, 2, and 3, and having a finger H Fig. 2, resting upon the adjustable sleeve D mounted upon the spindle D projecting from the spring-box D Fig. 3. The arm H is so arranged that its free end is capable of a limited downward movement, so that when the drill passes through the circle the finger H drops off the end of sleeve D, Fig. 3. This allows a spacing-piece H Fig. 1, carried by arm H, to pass between the rapidly-revolving cam H and the end of the rod H Figs. 1, 2, and 3, normally held in the position shown by the spring H, but capable of a certain amount of longitudinal motion, and this longitudinal motion is imparted to it each time the spacing-piece H passes between it and the cam H The rod H has an inclined face H at its opposite end, and this inclined face bears against the projection H on the springdetent 11*, holding the lever J, Figs. 3 and 4. When the rod H is moved longitudinally, its inclined face engages the projection H and thereby retracts the pivoted detent from in front of the lever J, Fig. 1, allowing the latter to move forward.

The detent, from Figs. 1, 3, 4, and 5, it will be observed, is pivoted centrally and moves in a horizontal plane. In its normal position its free end projects in front of the upper end of the lever J and holds the latter retracted; but when the rod H is moved in by the cam through the interposition of the spacing-piece the incline on the rod pressing against the forward end of the detent, or more properly against the projection H on the forward end of the detent, operates it, as described. This lever is mounted upon a stud F fixed to the top of the bracket F projecting from head A and is connected by the connecting-rod J to the lever J 3 on the picking-shaft J sup ported in bearings J fixed to the gauntree A and this picking-shaft J 4 is connected by the arm J 6 and link J 7 to the'pawl A of the ratchet picking motion. A spring J inclosed in a spring-box J 9 on the shaft J Fig. 3, is coiled IIO IIS

round said shaft and is so arranged that as soon as lever J is released the picking-shaft, moving under the influence of such spring, turns sufficiently to bring the pawl A onto the next tooth of the ratchet A and at the same time draws the lever J toward it. The lever J has an arm K connected by a link to the arm K on the rocking shaft K Fig. 1, mounted in bearings f in the casting F F and when the lever J is moved in the abovedescribed manner this shaft is also partly turned. The shaft K has an arm K Figs. 11, 12, and 13, fixed to its opposite end, carrying a spring-stud K and when the shaft K is moved the said stud bears upon the incline K, carried by the bracket K on casting F, and such stud is moved longitudinally, so that the antifriction-roller K on the end thereof is moved into the same plane as and within reach of the cam K mounted upon the sleeve F This is shown in detail in Figs. 11, 12, and 13, as well as in Figs. 2 and 3. The antifriction-roller is only held in this position until the rise of the cam K engages it, and by vibrating the arm K turns the shaft K and through the medium of the connecting mechanism restores the lever J to its normal posi tion, where the detent II" retains it, and at the same time rocking the pickingshaft J so as to turn the picking mechanism the distance of one tooth of the ratchet and thereby move the circle into position for the next hole to be drilled and centered. As soon. as the cam K has effected this movement, a reduced portion or depression in its periphery allows the spring-stud to spring back to the position shown in the drawings, thus moving the antifriction-roller out of the path of the cam, where it remains until the hole is drilled.

For very delicate drilling a sliding piece L, carrying the drill-chuck, is accurately fitted in the adjustable screw-plug L, fitting a female screw-thread in the hollow nose of the spindle 13, as shown in Figs. 6 and 7. This sliding piece is free to move inward, but is made to rotate with the plug by a pin L fixed in plug L and passing through the slot L in sliding piece L. A light spiral spring L is placed in the hollow nose of the spindle to press sliding piece L to its normal limit, so that the maximum feed-pressure on the drill cannot exceed the pressure required to compress this spring, and this pressure may be regulated by screwing plug L in or out. If this spindle is used for work too heavy for the spring L a second pin, similar to pin L is passed through the slot L but at the opposite end, so as to prevent the sliding piece L being pressed inward.

\Vhen the sliding piece L is in use, I employ a modified arrangement (shown in Figs. t and 5) to bring the picking mechanism into operation. In this case the finger ll rests upon the nose of the spindle and is fixed upon the light shaft M, mounted in bearings M, supported by bracket F and head A, and the spacing-piece 11 corresponding exactly to the spacing-piece II in the other figures, is fixed on the other end of this shaft. An annular groove M is formed in the sliding piece L on the spindle, and the parts are so arranged that when each hole is completed the finger H drops into such groove, thereby slightly turning the shaft M and thus introducing the spacingpiece H between the cam H and the end of the rod H \Vith the exception of the light shaft M and the means for moving it with the spacing-piece the parts are the same and bear the same relation to each other as in the other figures, and, as in the other figures, thus referring to these figures as well as to Figs. 1, 2, and 3, the cam H is mounted on a short shaft M mounted in the bracket M connected to bracket F and this shaft is rapidly rotated by the band M", communicating motion from the pulley M 011 the driving-shaft G to the pulley M on shaft M To lift the spacing-piece in both forms of device from between the cam II and the rod H, a second cam N is mounted upon shaft M, which engages the arm N, (lettered N in Figs. 4 and 5,) connected rigidly with the spacing-piece, and at each revolution lifts the spacing-piece into its normal position until the spindle B is withdrawn and fin ger H is clear of the groove M Fig. 9 is a separate view of the cam-shaft M and certain other parts.

When the finger H is carried by the arm H, as described above with reference to Figs. 1, 2, and 3, the second cam N, Fig. 3, is also employed, as before stated, to lift arm II by engaging the finger N, Fig. 2.

A separate drifting or cuttinghead is preferably employed, mounted at the other side of the machine and adapted to carry two or more drifts or cutters capable of delicate adjustment in relation to each other. The spindle or spindles of the cutting-head is or are moved longitudinally by a cam motion arranged to quickly withdraw the cutters, and such cam may be driven by different mechanism and at a greater speed to that operating the drilling-cam.

The same picking motion may be employed for the drifting or cutting head; but it is in this case operated at each motion of the drift ing-spindle after the cutters are withdrawn.

The drifting or cutting-head O mounted on the gauntree A as shown in Figs. 3 and 15 and a separate side view in Fig. 14, is provided with a spindle O, of square or other suitable section, fitted in bearings in said head so that it is free to slide to and fro longitudinally. This spindle is adapted to carry two drifts or cutters fixed in the chucks or holders 0 mounted upon the vertical slides O" O, and adjusted by the screws 0 The slides O O are formed on the horizontal sliding piece 0 0 (adjusted by the screws 0 0 fitting in guides O 0 secured to the end of the spindle O. The opposite end of the spindle 0' carries an antifriction-roller 1, bearing against the cam I, whichis arranged as it rotates to press the spindle O inward to pass the drifts through the holes, and a spiral spring inclosed in a spring-box and surrounding the spindle, bears against the collar 0 on the spindle, and moves the spindle in the reverse direction to the cam to withdraw the drifts. After the drifts are withdrawn the cam P is so formed that they remain in that position until the picking motion is brought into operation and the pick made as now described.

The cam I is mounted upon the shaft 1, revolving in bearings I connected to the head 0, and such shaft is driven by the band 1, connecting the pulley I on the main shaft G to the pulley I on shaft P The shaft P Fig. 3, also carries a crank-disk P the crank-pin I of which is connected by the rod P to the arm P of the pickii'lg-shaft J and by this means the picking motion is brought into operation at each movement of the spindle 0.

The length of the rod P is adjustable to allow the head 0 to be moved inward or out ward. The crank-pin P is fitted in a sliding block R, fitting a slot in the end of the rod, and a spring R, the pressure of which is regulated by the screw R bearing upon said block. The spring R is confined between the end of the slotand the nut R of the screw, so that the screw which freely passes through a hole in the end of the slot tends under the influence of the spring to keep the block R at the opposite end of the slot; but nevertheless in case of abnormal pressure the block is free to move in the slot.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is-- 1. In a drilling machine, the combination with a reciprocating tail piece with mechanism for reciprocating the same, of two parallel drill spindles moved simultaneously toward and from the work by said tail piece and a feed mechanism for feeding the work a distance corresponding to the distance between the drills, whereby the holes may be centered by the tool carried by one spindle and drilled by the tool carried by the other spindle; substantially as described.

2. In a drilling machine, the combination with the reciprocatory tail piece, of two parallel spindles moved longitudinally by said tail piece and a spring interposed in the connection between the tail piece and one of the spindles; substantially as described.

3. In a drilling machine, the combination with the reciprocatory tail piece, of two spindles moved longitudinally by said tail piece and a speed reducing mechanism interposed in the connection between the tail piece and one spindle whereby one spindle is advanced more rapidly than the other; substantially as described.

I. In a drilling machine, the combination with the reciprocatory spindles and a mechanism for reciprocating both of the same, of a speed reducer interposed in the operating connections of one spindle; substantially as described.

5. In a drilling machine, the combination with the reciprocatory spindles and crosshead or tailpiece for advancing both spindles, of a lever pivoted on the tail piece and having one arm cooperating with the spindle slide and another and longer arm cooperating with a fixed bearing whereby the speed of the spindle is reduced; substantially as described.

(3. In a drilling machine, the combination with the two reciprocating spindles and a tail piece for simultaneously advancing the spindles, of adjustable bearings for one spindle and a loose connection interposed between said spindle and tail piece whereby the adjustment of the spindle does not break its operating connection with the tail piece; sub stautially as described.

7. In a drilling machine, the combination with the centering spindle, of the boring spindle, a vertically movable carriage in which said boring spindle is journaled, a pivoted block having ways for said carriage, and adj ustin g mechanism for the carriage and block; substantially as described.

8. In a drilling machine, the combination with a reciprocatory tail. stock, and a centering spindle moved longitudinally thereby, of a boring spindle also moved longitudinally by said tail stock and mounted in bearings held in parallelism with the centering spindle and adjustable in a vertical and a horizontal direction with relation to said centering spindle; substantially as described.

9. In a drilling machine, the combination with a reciprocatory tail piece, of a spindle mounted in adjustable bearings, and a pivoted fork and stud forming the connection between the tail piece and spindle, whereby the adjustment of the spindle does not break. the operative connection with the tail piece; substantially as described.

10. In a drilling machine, the combination with the longitudinally movable spindle and a controlling finger released by the movement of the spindle, of a picking mechanism, a rotary cam controlling the same and a spacer operated by the controlling finger for throwing the cam into operative connection; substantially as described.

11. In a drilling machine, the combination with the longitudinally movable spindle and a controlling finger released by the movement of the spindle, of a picking mechanism, a detent for holding the same in check, a revolving cam for throwing the detent out of operation and a spacer moved by the eontrollin g finger for throwing the cam into operative connection with the detent; substantially as described.

12. In a drilling machine the combination with the drilling spindle and means for advancing the same, of a rapidly moving cam for retracting said spindle and a slowly moving cam forming a gage for regulating the depth of the cut at each reciprocation, and gearing for moving said cams; substantially as described.

13. In a drilling machine, the combination with the drilling spindle and means for advancing the same, of the cam for withdrawing the spindle, the cam forming a gage to regulate the depth of the cut at each reciprocation and change gearing interposed between the cams whereby a differential speed is imparted to the cams; substantially as described.

11. In a drilling machine, the combination with the drilling spindle and means for advancing the same and a picking mechanism controlled by the spindle, of the slowly moving cam for gaging the depth of the cut, the

rapidly moving cam for withdrawing the spindle a number of times during the boring of each hole and a picker operating cam moving in unison with the withdrawing cam; substantially as described.

15. In a drilling machine, the combination with the reciprocatory spindle and a rotary picker cam, of a picker, a detent controlled by the spindle for holding the picker in check and a spring for moving the picker into position to be operated by the cam when released by the movement of the spindle; substantially as described.

In testimony whereof I have hereunto set my hand in the presence of the two subscribing witnesses.

JOHN WALTER BRADLEY.

Witnesses: 7

DAVID NowELL, CHARLES BONFIELD. 

